Foundation pit supporting steel sheet pile welding equipment

Abstract

The invention relates to foundation pit supporting steel sheet pile welding equipment which comprises a welding unit, a guide unit and a protection unit, the guide unit comprises a supporting mechanism erected on a steel sheet pile, a position adjusting mechanism is arranged on the supporting mechanism, a limiting piece is arranged on the position adjusting mechanism, and a fine adjustment mechanism is arranged on the limiting piece. The protection unit comprises a fixed cover body and a movable cover body, an adjusting mechanism is arranged on the movable cover body, when the corner side of the corner pile needs to be welded, the movable cover body is adjusted to be of a straight barrel-shaped structure through the adjusting mechanism, and when the opposite side of the corner of the corner pile needs to be welded, the movable cover body is adjusted to be of an umbrella-shaped structure through the adjusting mechanism. According to the invention, the deformable cover body is combined with welding seam mechanical guidance to solve different problems when the corner pile is welded at a narrow corner and a wide side surface, and the shape of the cover body can be dynamically changed according to the welding position to actively adapt to the environment, so that the welding quality and reliability of the corner pile are improved.

Description

Technical Field

[0001] This invention relates to the field of sheet pile welding technology, and in particular to a sheet pile welding device for foundation pit support. Background Technology

[0002] Sheet piles for foundation pit support are specialized steel components that form a continuous support structure through interlocking connections. After the sheet piles are driven into the soil around the foundation pit, they form a continuous vertical retaining wall to prevent the foundation pit slope from collapsing or landslides. Corner piles are special irregular components used at the corners of the foundation pit plane in the sheet pile system for foundation pit support. They are usually composed of conventional sheet piles and interlocking fasteners welded to the sheet piles.

[0003] When welding sheet piles and locking components, gas shielded welding is usually used. In practice, workers need to hold the welding end and move it along the weld seam, which makes it difficult to ensure the stability of the angle and position of the welding end, and defects such as incomplete penetration and undercut are prone to occur.

[0004] In addition, due to the narrow space at the corner of the locking component, the protective gas is prone to stagnation and loss at this position, forming turbulence, which leads to protection failure and defects such as porosity, reduces the density and fatigue strength of the weld, and affects the welding quality. On the other hand, the opposite side of the corner of the locking component is relatively open and is easily affected by crosswinds, which causes the jet of protective gas flow to be blown away, reducing the gas protection effect in the arc zone. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a steel sheet pile welding device for foundation pit support to solve the technical problems existing in the prior art. The device includes a welding unit, a guiding unit and a protective unit. The welding unit is a gas shielded welding device and includes a welding end.

[0006] The guiding unit includes a support mechanism mounted on the sheet pile, a position adjustment mechanism on the support mechanism, a limiting component for inserting the welding end on the position adjustment mechanism, and a fine-tuning mechanism on the limiting component for fine-tuning the welding angle.

[0007] The protective unit includes a fixed cover that is fixedly installed outside the welding wire, and a movable cover that is provided outside the fixed cover. The movable cover is provided with an adjustment mechanism. When welding is required on the corner side of the corner pile, the movable cover is adjusted into a cylindrical structure by the adjustment mechanism. When welding is required on the opposite side of the corner pile, the movable cover is adjusted into an umbrella-shaped structure by the adjustment mechanism.

[0008] Preferably, the support mechanism includes a horizontal plate, with handles fixedly installed on the upper sides of both ends of the horizontal plate, and L-shaped plates hinged to the lower sides of both ends of the horizontal plate. The vertical section of the L-shaped plate is a telescopic structure, and the upper and lower ends of the horizontal section of the L-shaped plate are provided with ball bearings, and a locking hole is provided in the middle of the horizontal section of the L-shaped plate.

[0009] Preferably, the position adjustment mechanism includes a base plate, on which a vertically penetrating groove 1 is formed, and on the side wall of the base plate a front-to-back penetrating groove 2 is formed. A limiting member is slidably installed in the groove 1. Connecting block 1 and connecting block 2 are fixedly installed on the upper sides of both ends of the base plate, respectively. Connecting block 1 has two fixing holes at its upper end, and connecting block 2 has one fixing hole at its upper end. The side wall of the horizontal plate has two sets of connecting holes, each set containing four connecting holes. A connecting rod is inserted between the fixing hole on connecting block 2 and one of the fixing holes on connecting block 1 and the corresponding connecting hole.

[0010] Preferably, the fine-tuning mechanism includes arc-shaped grooves on both sides of the fixed cover, with a return spring connected to both ends of the arc-shaped grooves. A connecting plate is fixedly installed on the opposite ends of the two return springs. A cylindrical protrusion is provided on the opposite side of the connecting plate. A connecting rod is provided between the two connecting plates. An insertion hole corresponding to the cylindrical protrusion is opened on the connecting rod, and the cylindrical protrusion is inserted into the insertion hole.

[0011] The connecting rod has strip-shaped protrusions evenly distributed around its side wall at the end away from the connecting plate. A rotating rod is fitted around the outside of the connecting rod. The side wall of the rotating rod has strip-shaped grooves that correspond one-to-one with the strip-shaped protrusions and slide together. The end of the rotating rod away from the connecting rod slides through the second groove.

[0012] Preferably, the movable cover includes a mounting cylinder connected to the fixed cover. Multiple arc-shaped plates are evenly hinged to the lower end of the mounting cylinder along its circumference. The arc-shaped plates are divided into two groups at the front and back. Multiple exhaust holes are opened at the end of the arc-shaped plates away from the mounting cylinder. A windproof membrane is connected between adjacent arc-shaped plates.

[0013] Preferably, the adjustment mechanism includes a sliding groove on the outer wall of the arc plate, a slider is slidably installed in the sliding groove, the slider is hinged to one end of the adjustment rod, the other end of the adjustment rod is fixedly connected to an adjustment ring, a drive ring is rotatably installed on the adjustment ring, and the drive ring is threadedly connected to the mounting cylinder.

[0014] Preferably, a baffle is installed at the lower end of the slider, the inner side of the baffle is in contact with the outer side of the arc plate, and an elastic rubber layer is adhered to the inner side of the baffle.

[0015] Preferably, the exhaust holes on the front arc plate gradually tilt towards the fixed cover from the inside out, while the exhaust holes on the rear arc plate gradually tilt away from the fixed cover from the inside out.

[0016] Preferably, the mounting sleeve is disposed on the outside of the fixed cover, and the fixed cover and the mounting sleeve are connected by a threaded connection.

[0017] As can be seen from the above technical solutions, the steel sheet pile welding equipment for foundation pit support designed in this invention has the following beneficial effects: 1. This invention combines a deformable cover with mechanical guidance for the weld to address the different challenges of welding corner piles at narrow corners and wide sides. It can dynamically change the shape of the cover according to the welding position to actively adapt to the environment, thereby improving the quality and reliability of corner pile welding.

[0018] 2. The guide unit provides the welding torch with a rigid and stable moving track and angle fine adjustment capability, which effectively avoids the shaking and instability of manually holding the welding torch, and fundamentally reduces welding defects such as incomplete penetration and undercut caused by improper welding torch angle and position.

[0019] 3. The protective unit adapts to the welding requirements at corners and on the opposite side of the corner. At the corner, the cylindrical movable cover concentrates and guides the protective gas to form a stable axial air curtain, preventing the gas from stagnating, flowing turbulently, or dissipating at the corner, thereby avoiding porosity defects. On the opposite side of the corner, the umbrella-shaped movable cover expands the windproof range and forms a local air chamber, effectively resisting crosswind interference, preventing the protective airflow from being blown away, and ensuring the gas protection effect in the arc zone. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the guidance unit.

[0023] Figure 3 It is a three-dimensional structural diagram of the fixed cover, the movable cover, and the adjustment mechanism.

[0024] Figure 4 It is a side structural diagram of the fixed cover, the movable cover, and the adjustment mechanism.

[0025] Figure 5 It is a cross-sectional structural diagram of the fixed cover, the movable cover, and the adjustment mechanism.

[0026] Figure 6 It is a three-dimensional structural diagram of horizontal plates, L-shaped plates, etc.

[0027] Figure 7 It is a three-dimensional structural diagram of the connecting rod and the rotating rod.

[0028] Figure 8 It is a three-dimensional structural diagram of the fixed cover, the return spring and the connecting plate.

[0029] Reference numerals: 1. Welding unit; 2. Guide unit; 20. Positioning pin; 21. Limiting component; 22. Support mechanism; 221. Horizontal plate; 222. L-shaped plate; 23. Position adjustment mechanism; 231. Base plate; 232. Connecting block one; 233. Connecting block two; 234. Connecting rod; 24. Fine-tuning mechanism; 241. Return spring; 242. Connecting plate; 243. Connecting rod; 244. Rotating rod; 3. Protective unit; 31. Fixed cover; 32. Movable cover; 321. Mounting cylinder; 322. Arc plate; 323. Exhaust hole; 324. Windproof membrane; 33. Adjustment mechanism; 331. Slider; 332. Adjusting rod; 333. Adjusting ring; 334. Drive ring; 335. Baffle. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figure 1 A welding device for steel sheet piles for foundation pit support includes a welding unit 1, a guiding unit 2 and a protective unit 3. The welding unit 1 is a gas-shielded welding device using existing technology, including a welding power source, a wire feeding mechanism, a welding end, a gas cylinder and a pressure regulator. The welding end consists of welding wire, a wire feeding mechanism and a conductive nozzle. The gas cylinder and pressure regulator are not shown in the figure.

[0032] See Figure 1 , Figure 2 , Figure 7 and Figure 8 The guiding unit 2 includes a support mechanism 22 mounted on the steel sheet pile. The support mechanism 22 is provided with a position adjustment mechanism 23. The position adjustment mechanism 23 is provided with a limiting member 21 for inserting the welding end. The limiting member 21 is provided with a fine adjustment mechanism 24 for fine adjustment of the angle of the welding end.

[0033] See Figure 2 ,and Figure 6 The support mechanism 22 includes a horizontal plate 221. Handles are fixedly installed on the upper sides of both ends of the horizontal plate 221. L-shaped plates 222 are hinged to the lower sides of both ends of the horizontal plate 221. The vertical section of the L-shaped plate 222 is a telescopic structure. Ball bearings are provided at both the upper and lower ends of the horizontal section of the L-shaped plate 222. A locking hole is provided in the middle of the horizontal section of the L-shaped plate 222.

[0034] When not in use, the vertical section of the L-shaped plate 222 is shortened and the L-shaped plate 222 is flipped so that the vertical section of the L-shaped plate 222 is horizontal and the two horizontal sections of the L-shaped plate 222 are in close contact with each other. At this time, the two locking holes correspond one to one, and the positioning pin 20 can be passed through the two locking holes to lock the L-shaped plate 222 in the flipped state, thereby reducing the overall space occupied by the support mechanism 22 and making it easier to store and transport.

[0035] Positioning holes are provided on both the telescopic end and the fixed end of the vertical section of the L-shaped plate 222. When welding is required, the positioning pin 20 is removed from the locking hole, and the L-shaped plate 222 is flipped back to its original position, so that the vertical section of the L-shaped plate 222 is in a vertical state. Then, the vertical section of the L-shaped plate 222 is extended so that the telescopic end aligns with the positioning hole on the fixed end. At this time, the positioning pin 20 can be passed through the two positioning holes to lock the length of the vertical section of the L-shaped plate 222, so that it can provide rigid support. Then, the two horizontal sections of the L-shaped plate 222 are slid into the locking structures on both sides of the horizontally placed steel sheet pile (e.g., ...). Figure 1 As shown, the ball bearings at the upper and lower ends of the horizontal section of the L-shaped plate 222 contact the locking structure. During subsequent movement, the locking structure guides the L-shaped plate 222, thereby improving the stability of the movement, making the flow path of the protective air curtain more stable, reducing the disturbance of the protective air curtain caused by irregular oscillation at the welding end, thereby reducing the chance of squeezed air flowing around and intruding, and thus improving the quality of the weld.

[0036] See Figure 2 The position adjustment mechanism 23 includes a base plate 231. A sliding groove 1 that runs vertically through the base plate 231 is provided on the base plate 231. A sliding groove 2 that runs front to back through the base plate 231 is provided on the side wall of the base plate 231. A limiting member 21 is slidably installed in the sliding groove 1. Specifically, the limiting member 21 is a rectangular block with a limiting groove. An adjusting screw can be provided between the limiting member 21 and the sliding groove 1. One end of the adjusting screw is rotatably connected to the limiting member 21, and the other end runs through the sliding groove 1 and is threadedly connected to the base plate 231. By rotating the adjusting screw, the limiting member 21 can be driven to slide in the sliding groove 1, thereby adapting to the actual welding requirements.

[0037] Connecting block 1 232 and connecting block 233 are fixedly installed on the upper sides of both ends of the substrate 231, respectively. Connecting block 1 232 has two fixing holes at its upper end, and connecting block 233 has one fixing hole at its upper end. The side wall of the horizontal plate 221 has two sets of connecting holes, with four connecting holes in each set. Connecting rods 234 are inserted between the fixing holes on connecting block 233 and one of the fixing holes on connecting block 1 232 and the corresponding connecting holes. The fixing holes can be matched with the connecting holes at different positions according to actual needs to avoid interference from the substrate 231 or other components to the welding operation.

[0038] To improve the stability of the connection, the connecting rod 234 and the connecting hole can be connected by a thread. After the welding operation is completed, the connecting rod 234 can be removed from the connecting hole and the fixing hole, thereby separating the position adjustment mechanism 23 from the support mechanism 22.

[0039] See Figure 3 , Figure 7 and Figure 8 The fine-tuning mechanism 24 includes arc-shaped grooves on both sides of the fixed cover 31. Both ends of the arc-shaped grooves are connected to return springs 241. Connecting plates 242 are fixedly installed on the opposite ends of the two return springs 241. Columnar protrusions are provided on the opposite sides of the connecting plates 242. A connecting rod 243 is provided between the two connecting plates 242. For easy assembly, the connecting rod 243 is an elastic and telescopic structure. Insertion holes corresponding to the columnar protrusions are opened on the connecting rod 243, and the columnar protrusions are inserted into the insertion holes.

[0040] The connecting rod 243 has strip-shaped protrusions evenly distributed around the side wall of the end away from the connecting plate 242. A rotating rod 244 is sleeved on the outside of the connecting rod 243. The side wall of the rotating rod 244 has strip-shaped grooves that correspond to the strip-shaped protrusions and slide together. The end of the rotating rod 244 away from the connecting rod 243 slides through the groove and is threadedly connected to the limiting member 21. To facilitate the rotation of the rotating rod 244, a rectangular block is fixedly provided at the end of the rotating rod 244 away from the connecting rod 243.

[0041] Before welding, insert the welding end into the limiting hole of the limiting member 21, shorten the connecting rod 243 and place it between the connecting plates 242 so that the cylindrical protrusion is inserted into the corresponding insertion hole. Then loosen the connecting rod 243 so that the connecting rod 243 returns to its initial length and the strip protrusion on it extends into the strip groove of the rotating rod 244 to complete the assembly.

[0042] During welding, the position of the limiting component 21 is adjusted according to actual needs to adjust the horizontal position of the welding end, and the tilt angle of the welding end is adjusted by rotating the rotating rod 244. If it is necessary to fine-tune the angle of the welding end during the welding process, the welding end can be manually swung. During this process, the connecting rod 243 can slide in the arc groove and squeeze the return spring 241 through the connecting plate 242. After the manual swaying action is stopped, the welding end can return to the balanced state under the action of the return spring 241.

[0043] See Figure 1 and Figure 3The protective unit 3 includes a fixed cover 31 fixedly mounted outside the welding end. The fixed cover 31 has an air inlet connected to a gas cylinder via a flexible hose. A movable cover 32 is located outside the fixed cover 31, and the movable cover 32 is equipped with an adjustment mechanism 33. When welding is required on the corner side of the corner pile, the adjustment mechanism 33 adjusts the movable cover 32 into a cylindrical structure. When welding is required on the opposite side of the corner pile, the adjustment mechanism adjusts the movable cover 32 into an umbrella-shaped structure. During welding, the gas cylinder delivers protective gas through the air inlet to the fixed cover 31 and the movable cover 32 to displace air at the welding position, preventing problems such as porosity or oxidation.

[0044] See Figure 3 , Figure 4 and Figure 5 The movable cover 32 includes a mounting cylinder 321 connected to the fixed cover 31. Multiple arc-shaped plates 322 are evenly hinged to the lower end of the mounting cylinder 321 along its circumference. The arc-shaped plates 322 are divided into two groups at the front and back. Multiple exhaust holes 323 are opened at the end of the arc-shaped plates 322 away from the mounting cylinder 321. A windproof membrane 324 is connected between adjacent arc-shaped plates 322.

[0045] See Figure 5 The mounting cylinder 321 is sleeved on the outside of the fixed cover 31, and the fixed cover 31 and the mounting cylinder 321 are connected by a thread. By rotating the mounting cylinder 321, its relative position with the fixed cover 31 can be adjusted, further increasing the adjustability of the extension length of the movable cover 32.

[0046] Continue reading Figure 3 , Figure 4 and Figure 5 The adjustment mechanism 33 includes a sliding groove on the outer wall of the arc plate 322. A slider 331 is slidably installed in the sliding groove. The slider 331 is hinged to one end of the adjusting rod 332. The other end of the adjusting rod 332 is fixedly connected to an adjusting ring 333. A driving ring 334 is rotatably installed on the adjusting ring 333. The driving ring 334 is threadedly connected to the mounting cylinder 321.

[0047] When welding is required on the corner side of the corner pile, the drive ring 334 is rotated, causing the adjusting ring 333 to move axially along the mounting cylinder 321. The adjusting ring 333 drives the slider 331 to slide along the groove via the adjusting rod 332, thereby causing the arc plate 322 to rotate around its hinge point with the mounting cylinder 321 until the arc plate 322 and the windproof membrane 324 together form a straight cylindrical structure. When welding is required on the opposite side of the corner pile, the drive ring 334 is rotated in the opposite direction, indirectly causing the arc plate 322 to rotate in the opposite direction, causing the arc plate 322 and the windproof membrane 324 to open and form an umbrella-shaped structure. Compared with the umbrella-shaped structure, the diameter of the straight cylindrical movable cover 32 is smaller and the length is increased, making it more suitable for welding in narrow positions at corners.

[0048] By adjusting the shape of the movable cover 32 in the above manner, the protective gas effect can be optimized for different spaces. In the wider position, i.e. the opposite side of the corner, the umbrella-shaped cover is used to increase the windproof range and reduce gas escape. In the narrower position, i.e. the corner, the extended thin cylindrical cover is used to avoid interference with the workpiece, while concentrating the protective gas to ensure the stability of the gas curtain in the arc zone, thereby reducing oxidation defects such as pores.

[0049] It should be noted that all components in the fixed cover 31 and the movable cover 32, except for the windproof membrane 324, are made of high-temperature resistant alloy materials, such as iron-based heat-resistant stainless steel. The windproof membrane 324 is approximately 50-100mm away from the molten pool and the electric arc (depending on the specific opening radius). It needs to withstand the heat radiation from the electric arc and the molten pool, rather than directly contacting the high temperature. The actual continuous temperature is approximately 150-300℃, depending on the welding current. Therefore, the windproof membrane 324 can be made of high-temperature resistant composite materials such as silicone rubber coated fiberglass cloth. The windproof membrane 324 can be connected to the arc-shaped plate 322 by adhesion or screw fixing, facilitating periodic replacement of the windproof membrane 324.

[0050] In addition, to facilitate observation of the weld during welding, an observation window (not shown in the figure) can be opened on the arc plate 322, and a high-temperature resistant transparent ceramic sheet can be installed at the observation window.

[0051] See Figure 3 The lower end of the slider 331 is equipped with a baffle 335. The inner side of the baffle 335 is in contact with the outer side of the arc plate 322. To improve the tightness of the fit, an elastic rubber layer can be adhered to the inner side of the baffle 335.

[0052] When the slider 331 moves along the groove, it drives the baffle 335 to move synchronously. When welding is required at the corner of the corner pile, the movable cover 32 is adjusted to a straight cylinder shape by the adjustment mechanism 33. At this time, the baffle 335 moves to the lower limit position with the slider 331. The baffle 335 blocks the exhaust hole 323, and the gas can only move along the axial direction of the straight cylinder movable cover 32. The single axial direction allows the air to be discharged quickly in a straight line, avoiding the formation of vortices in narrow places, while ensuring that the bundle of air curtain in the straight cylinder is not dispersed and maintaining the gas gathering effect.

[0053] When welding is required on the opposite side of the corner, the movable cover 32 is adjusted into an umbrella shape by adjusting mechanism 33. At this time, baffle 335 moves to the upper limit position with slider 331. Baffle 335 will not block exhaust port 323. Gas can move along the axial direction of umbrella-shaped movable cover 32 and can also be discharged from the exhaust port 323 opened on the side. The multi-directional distribution can evenly release the back pressure of protective gas and avoid local high pressure causing gas curtain turbulence.

[0054] It should be noted that during welding, the worker should be positioned on the left or right side of the protective unit 3 to avoid the gas venting from the exhaust holes 323 on the front and rear side baffles 335 interfering with the observation line of sight.

[0055] During welding, the worker guides the welding end from front to back using the guide unit 2. The vent holes 323 on the front side (i.e., the side away from the welding direction) of the arc-shaped plate 322 gradually tilt from the inside out towards the fixed cover 31. This allows the gas discharged from the vent holes 323 on this side to flow along the vent holes 323 towards the fixed cover 31, preventing the gas discharged from the front vent holes 323 from flowing directly to the weld tail that is solidifying at the front welded position. This reduces the contact between the weld tail that is solidifying at the front welded position and the air, preventing oxidation that could cause the weld tail to turn black and develop oxide scale, thus affecting the surface quality of the weld and subsequent inspection. When the test occurs, the vent 323 on the rear side (i.e., the side closer to the welding direction) of the arc-shaped plate 322 gradually tilts away from the fixed cover 31 from the inside out. This causes the gas discharged from the vent 323 to flow away from the fixed cover 31 (i.e., closer to the welding position) along the vent. This allows some of the protective gas to flow along the vent 323 to the next welding position, thus squeezing out the air at the welding position in advance. This prevents the molten pool from being oxidized due to incomplete air removal at the moment of arc ignition during subsequent welding. At the same time, the airflow discharged from the vent 323 can also blow away dust, moisture, and welding slag residue on the surface of the welding position, further improving the protective effect. To prevent the squeezed-out air from invading back and to ensure the stability of the protective gas curtain, a one-way valve can be installed in the vent 323.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] The above provides a detailed description of the steel sheet pile welding equipment for foundation pit support provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A welding device for steel sheet piles for foundation pit support, characterized in that, It includes a welding unit, a guiding unit, and a protective unit. The welding unit is a gas-shielded welding device, including the welding end. The guiding unit includes a support mechanism mounted on the steel sheet pile, a position adjustment mechanism on the support mechanism, a limiting component for inserting the welding end on the position adjustment mechanism, and a fine adjustment mechanism on the limiting component for fine adjustment of the angle of the welding end. The protective unit includes a fixed cover that is fixedly installed outside the welding end, and a movable cover that is provided outside the fixed cover. The movable cover is provided with an adjustment mechanism. When welding is required on the corner side of the corner pile, the movable cover is adjusted into a cylindrical structure by the adjustment mechanism. When welding is required on the opposite side of the corner pile, the movable cover is adjusted into an umbrella-shaped structure by the adjustment mechanism.

2. The sheet pile welding equipment for foundation pit support according to claim 1, characterized in that, The support mechanism includes a horizontal plate, with handles fixedly installed on the upper sides of both ends of the horizontal plate, and L-shaped plates hinged to the lower sides of both ends of the horizontal plate. The vertical section of the L-shaped plate is a telescopic structure, and the upper and lower ends of the horizontal section of the L-shaped plate are provided with ball bearings, and a locking hole is opened in the middle of the horizontal section of the L-shaped plate.

3. The sheet pile welding equipment for foundation pit support according to claim 2, characterized in that, The position adjustment mechanism includes a base plate, on which a vertically penetrating groove 1 is formed, and on the side wall of the base plate a front-to-back penetrating groove 2 is formed. A limiting member is slidably installed in the groove 1. Connecting block 1 and connecting block 2 are fixedly installed on the upper sides of both ends of the base plate, respectively. Connecting block 1 has two fixing holes at its upper end, and connecting block 2 has one fixing hole at its upper end. The side wall of the horizontal plate has two sets of connecting holes, with four connecting holes in each set. A connecting rod is inserted between the fixing hole on connecting block 2 and one of the fixing holes on connecting block 1 and the corresponding connecting hole.

4. The sheet pile welding equipment for foundation pit support according to claim 3, characterized in that, The fine-tuning mechanism includes arc-shaped grooves on both sides of the fixed cover, with return springs connected to both ends of the arc-shaped grooves. Connecting plates are fixedly installed on the opposite ends of the two return springs. Columnar protrusions are provided on the opposite sides of the connecting plates. A connecting rod is provided between the two connecting plates. The connecting rod has insertion holes corresponding to the columnar protrusions, and the columnar protrusions are inserted into the insertion holes. The connecting rod has strip-shaped protrusions evenly distributed around its side wall at the end away from the connecting plate. A rotating rod is sleeved on the outside of the connecting rod. The side wall of the rotating rod has strip-shaped grooves that correspond to the strip-shaped protrusions and slide together. The end of the rotating rod away from the connecting rod slides through the groove and is threadedly connected to the limiting component.

5. The sheet pile welding equipment for foundation pit support according to claim 1, characterized in that, The movable cover includes a mounting cylinder connected to the fixed cover. Multiple arc-shaped plates are evenly hinged to the lower end of the mounting cylinder along its circumference. The arc-shaped plates are divided into two groups at the front and back. Multiple exhaust holes are opened at the end of the arc-shaped plates away from the mounting cylinder. A windproof membrane is connected between adjacent arc-shaped plates.

6. The sheet pile welding equipment for foundation pit support according to claim 5, characterized in that, The adjustment mechanism includes a sliding groove on the outer wall of the arc plate, a slider is slidably installed in the sliding groove, the slider is hinged to one end of the adjustment rod, and the other end of the adjustment rod is fixedly connected to an adjustment ring. A drive ring is rotatably installed on the adjustment ring, and the drive ring is threadedly connected to the mounting cylinder.

7. The sheet pile welding equipment for foundation pit support according to claim 6, characterized in that, A baffle is installed at the lower end of the slider. The inner side of the baffle is attached to the outer side of the arc-shaped plate, and an elastic rubber layer is adhered to the inner side of the baffle.

8. The sheet pile welding equipment for foundation pit support according to claim 7, characterized in that, The exhaust holes on the front arc plate gradually tilt towards the fixed cover from the inside out, while the exhaust holes on the rear arc plate gradually tilt away from the fixed cover from the inside out.

9. The sheet pile welding equipment for foundation pit support according to claim 5, characterized in that, The mounting sleeve is fitted on the outside of the fixed cover, and the fixed cover and the mounting sleeve are connected by a threaded connection.

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